I've got a slight side to side sway I need to get rid of on the chair and in my thoughts are a telescoping brace and maybe a big spring or two but it fits in there perfect with an inch clearance over the batteries and all, and can be unbolted if the chair ever needs repairs.

The Wobble is Built Into the Jack

Think of that the next time you jack a car up and think of crawling under it without using jack stand,

I got some solid 5/8 rod smooth, two piece of 3/4 pipe ten inches long and a scrap of heavy angle iron, super heavy.

I just need to weld the angle to the rod holding the chair, lower it as far as it goes and then cut the solid rod so it hits the bottom of the chair which will lock it in place in the lower position tight, and weld the pipe to the angle iron so it slips up and down the rod and I can spread the force out away from the chair shaft for leverage, weld the bottom of the rod to the very bottom of the chair and dumb luck again I have plenty of room, and as the chair rises it will stay aligned vertically and get rid of the side to side motion at its highest level, then I'll take the chair to the hardware store and get a heavy spring to pull the chair backwards since it has a very very slight front to back wobble to.

I also got her a halogen head light and switch and anchors to mount a piece of finished plywood to the back of her chair for a second place to mount the joy stick and head light switch, and some hooks for holding shopping bags.

A bonus is this thing uses two sealed batteries with a high amperage rating and in a power outage the chair by my calculations will light a room for a minimum of 48 hours on a full charge, and I can ride it around the house looking for flashlights when the power goes off after dark!